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since + past simple/present perfect

What about the first verb, then? Could someone also (correctly) say "Since the time I have been a teenager I have changed my mind?"
And what about "Since the time I have been a teenager, I changed my mind" ?

Re: since + past simple/present perfect

Originally Posted by 5jj

[COLOR=#333333][FONT=Verdana] ... "I have changed my mind since I have been a teenager".

NOT A TEACHER

I have to say that I find this disconcerting. I remember a rule accoring to which Present Perfect "works" since a given point in time untill now. "Having been" a teenager hardly seems a point in time to me, but rather an extended period of time. Somehow "having become" a teenager works better for me, as it suggests a point in time.

I also have to admit that "Present Perfect" since "Present Perfect" structure is a revelation to me. "Present Perfect" since "Simple Past" has always seemed only correct. I suppose on your and the BBC's authority I am bound to try (not an easy thing to do at my age ) to also work the former into my English grammar.